From: Tan Tee Min Date: Fri, 29 Apr 2022 11:58:07 +0000 (+0800) Subject: net: stmmac: disable Split Header (SPH) for Intel platforms X-Git-Tag: v5.4.196~8 X-Git-Url: https://git.fsl.cs.sunysb.edu/?a=commitdiff_plain;h=e14e3856e94dd389f105de594974e1ade80a613a;p=wrapfs-5.4.y.git net: stmmac: disable Split Header (SPH) for Intel platforms commit 47f753c1108e287edb3e27fad8a7511a9d55578e upstream. Based on DesignWare Ethernet QoS datasheet, we are seeing the limitation of Split Header (SPH) feature is not supported for Ipv4 fragmented packet. This SPH limitation will cause ping failure when the packets size exceed the MTU size. For example, the issue happens once the basic ping packet size is larger than the configured MTU size and the data is lost inside the fragmented packet, replaced by zeros/corrupted values, and leads to ping fail. So, disable the Split Header for Intel platforms. v2: Add fixes tag in commit message. Fixes: 67afd6d1cfdf("net: stmmac: Add Split Header support and enable it in XGMAC cores") Cc: # 5.10.x Suggested-by: Ong, Boon Leong Signed-off-by: Mohammad Athari Bin Ismail Signed-off-by: Wong Vee Khee Signed-off-by: Tan Tee Min Signed-off-by: David S. Miller Signed-off-by: Tan Tee Min Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c index 9cbc0179d24e..9931724c4727 100644 --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c @@ -4531,7 +4531,7 @@ int stmmac_dvr_probe(struct device *device, dev_info(priv->device, "TSO feature enabled\n"); } - if (priv->dma_cap.sphen) { + if (priv->dma_cap.sphen && !priv->plat->sph_disable) { ndev->hw_features |= NETIF_F_GRO; priv->sph = true; dev_info(priv->device, "SPH feature enabled\n"); diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_pci.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_pci.c index fceb0f9e797f..0edcf3f704b7 100644 --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_pci.c +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_pci.c @@ -119,6 +119,7 @@ static int intel_mgbe_common_data(struct pci_dev *pdev, plat->has_gmac4 = 1; plat->force_sf_dma_mode = 0; plat->tso_en = 1; + plat->sph_disable = 1; plat->rx_sched_algorithm = MTL_RX_ALGORITHM_SP; diff --git a/include/linux/stmmac.h b/include/linux/stmmac.h index dc60d03c4b60..0b35747c9837 100644 --- a/include/linux/stmmac.h +++ b/include/linux/stmmac.h @@ -179,5 +179,6 @@ struct plat_stmmacenet_data { int mac_port_sel_speed; bool en_tx_lpi_clockgating; int has_xgmac; + bool sph_disable; }; #endif